回复：四位平方数，前两位和后两位都相同，怎么求？（知道是7744，但怎么推呢？

来源: 于 2010-06-16 21:08:58 [旧帖] [给我悄悄话] 本文已被阅读：次

Some times,"logic guess" is best.
11^2=121,so,121*x^2=aabb,x^2=81 is not good ,64 is OK.
121*64=7744.